34results about How to "Achieve alloying" patented technology

The invention belongs to the field of material preparation, and particularly relates to a method for preparing superfine high-purity high-solid-solubility tungsten-based alloy powder. According to the method, the content of adsorbed oxygen is reduced by combining multi-stage high-energy ball milling with a reduction heat treatment process, the introduction amount of solid solution elements is increased, a dislocation slippage mechanism of pure tungsten is effectively improved, tungsten particles are toughened, and the problem of low solid solubility of a traditional powder preparation method is solved. In the first stage, auxiliary materials are subjected to low-speed ball milling; and then prepared tungsten powder is added into ball milling equipment to be subjected to high-speed ball milling for a proper time, so that the problems of non-uniform particle size and impurity introduction of powder prepared through a traditional mechanical alloying method are effectively solved. The process is simple and controllable; and an obtained product is low in impurity content, narrow in particle size distribution, small in particle size and convenient for large-scale industrial application.

The invention discloses a non-magnetic low nickel abrasion-resistant and corrosion-resistant high nitrogen stainless steel. The non-magnetic low nickel abrasion-resistant and corrosion-resistant high nitrogen stainless steel is characterized by including, by mass percentage, 14%-15% of manganese, 14%-15% of chromium nitride, 0.002% of cobalt, 0.002% of niobium, 1% of silicon, 0.003% of phosphorus, 0.001% of sulfur, 0.2%-0.25% of nitrogen, 1.3%-1.5% of nickel, 0.01% of molybdenum, 0.002%-0.003% of vanadium, 0.004% of rich rare earth and the balance iron. The manganese and the nitrogen replace the nickel, direct application of a nitrogen alloy in stainless steel production is achieved, the strength of the stainless steel is improved, and it is guaranteed that no corrosion is generated in the usage period; the production and application cost of the stainless steel is reduced by 30% or above; and there is a very good promoting and leading effect on the stainless steel processing enterprise including transformation and upgrading and product structure adjustment of the screen cloth processing enterprise.

The invention discloses a laser additive manufacturing method of an in-situ synthesized nano Al2O3 reinforced aluminum-based composite material. The method comprises the following steps of (1) mixingZnO ceramic powders and AlSi10Mg aluminum alloy powders, and carrying out ball milling to obtain ZnO/AlSi10Mg composite powders; (2) carrying out additive manufacturing forming on the composite powders by adopting a selective laser melting process to form a solid sheet layer; (3) carrying out laser scanning on the solid sheet layer again to form a remelting sheet layer; (4) repeating the steps (2)and (3), and finally forming to obtain the in-situ synthesized nano Al2O3 reinforced aluminum-based composite material. A laser is used for exciting Al and ZnO to generate aluminothermic reactions between the Al and ZnO to generate Al2O3 ceramic particles in situ, the overall process design of the method is improved, selective laser melting and laser remelting scanning are matched, the prepared aluminum-based composite material is high in density and fine in microstructure, the in-situ synthesized Al2O3 particles are nanoscale in size and are uniformly distributed, and the phase interfaces ofthe Al2O3 particles are well combined with an aluminum matrix.

The invention discloses a process for preparing a (Ti,Al)BN ceramic amorphous-nanocrystalline wear-resistant anti-corrosion composite coating. The process comprises the following steps of: performing dual-cathode plasma sputtering deposition; performing ionic nitriding, wherein the sputtered target is a powder metallurgy sintered plate of which the mass ratio of Ti to B to Al is 6:3:1, and which is prepared by a hot isostatic pressure process, and a workpiece material is titanium alloy. By a dual-cathode plasma sputtering technology, the (Ti,Al)BN amorphous-nanocrystalline composite coating is generated in situ by adjusting the ratio of the components of a target to gas. A preparation process is simplified, and the whole performance of the coating is improved.

The invention provides an Al-Ti-B target material and a powder solid phase alloying sintering method thereof. The method comprises the following steps of firstly, weighing and mixing, secondly, ball grinding mechanical alloying, thirdly hot pressing sintering, fourthly, demolding, fifthly, annealing treatment and sixthly, forging. According to the Al-Ti-B target material and the powder solid phasealloying sintering method thereof, high-content Ti and B are added into an Al matrix to be prepared into the Al-Ti-B target material, the content of Ti can reach up to 80%, and the content of B can reach up to 20%; on the basis of an Al-Ti-B ternary alloy, other elements can be added to obtain the alloy target material with more elements; due to the fact that the low temperature and large pressure solid phase sintering method, melting and flowing of low-melting-point alloy elements are avoided, and through the diffusion action, alloying between high-melting-point alloy elements and low-melting-point alloy elements is achieved; and the technological process is short, product quality is stable, production cost is low, and the Al-Ti-B target material and the method are suitable for batched production.

The invention discloses an aluminum-titanium-boron production process, comprising the following steps: firstly, carrying out reduction reaction on raw materials in a reduction platform package, and stirring by adopting a stirrer according to the requirements in reduction reaction; carry out alloying operation in an inverter frequency furnace after reduction reaction is ended; finally processing alloy aluminum liquid in a continuous casting and rolling process through a crucible, so as to obtain an aluminum-titanium-boron product, wherein the crucible is a crucible discharging aluminum liquid from the bottom, the inverter frequency furnace is a coreless induction furnace, and the electromagnetic stirring force inside a hearth is proportional to specific power density of an electric furnace and inversely proportional to square root of work frequency. Reduction reaction is separated from the alloy operation, the problem that the temperature sharply changes and cannot be controlled due to a lot of heat generated in reduction reaction is avoided, meanwhile, the hold-up time of the crucible is reduced, and the capacity is improved. Discharge of the aluminum liquid from the crucible is changed into a bottom discharge method, and electromagnetic stirring generated by the inverter frequency furnace can be utilized to prevent participation of titanium element, and therefore no holding furnace or electromagnetic stirrer are needed and investment in equipment is reduced.

The invention discloses an arc additive manufacturing in-situ alloying device and method capable of achieving alternate wire melting and powder supply. The device comprises a spraying device, a wire melting device and a turnover workbench. Through the gas power spraying device, in-situ spraying of multiple kinds of pure metal powder, alloy powder and metal-ceramic composite powder can be achieved,and alloying and compounding of an arc additive manufacturing material can be achieved to the greatest degree. When the gas power spraying device carries out in-situ powder spraying, generated high-speed gas jet flow carrying powder particle impacts on the surface of a deposition layer, the function of stress peening is achieved, a pressure stress layer is introduced, surface roughness is reduced, and the structure performance of an arc additive manufacturing metal component is optimized. The device completely depends on existing welding equipment existing spraying equipment in the market, additional equipment research and development expenditures are not needed, the powder spraying process and the subsequent arc wire filling process are controlled by programming of a six-axis joint robot, automatic operation can be carried out, and the work efficiency is high.

The invention discloses a hard alloy based on tungsten carbide and a preparation method of the hard alloy. The hard alloy comprises a tungsten carbide hard phase and a binding phase, wherein the binding phase is a high-entropy alloy. The preparation method comprises the following steps of (1) weighing tungsten carbide powder in specific parts by mass and simple substance powder of each element in the high-entropy alloy; (2) mixing the tungsten carbide powder and the simple substance powder and then transferring into a ball mill to be subjected to ball milling, and obtaining a mixed material after drying; and (3) molding and sintering the mixed material to obtain the hard alloy based on tungsten carbide. According to the hard alloy, adverse effects of cobalt on health safety and environmental safety are reduced, the production cost of the hard alloy is reduced, and the bonding strength of the alloy is improved. According to the preparation method of the hard alloy, the process flow is reduced, the probability that the raw materials are polluted is reduced, and the preparation method has the advantages that the production cost of the hard alloy is reduced, and the quality of the hard alloy is improved.

The invention relates to a nodulant for alloying nodular cast iron, which comprises the following elements in percent by mass: 83.5-94 percent of Cu, 5-15 percent of Mg and 1.0-1.5 percent of RE. By using the nodulant, the nodular cast iron can be nodulized and alloyed. Because the nodulant does not contain Si, the consumption of scrap returns can be increased to lower the production cost.

The invention discloses an RE4TCd magnetic refrigeration material. RE is one or a mixture of two of rare earth elements Dy, Ho and Tm, and T is one or a mixture of two of transition metal elements Ni and Cu. The invention also discloses a preparation method of the RE4TCd magnetic refrigeration material, which comprises the following steps: mixing and melting the rare earth metal and the transition metal into an RE4T alloy ingot, crushing the RE4T alloy ingot, mixing the crushed RE4T alloy ingot with Cd powder, sintering in a sealed mold at high pressure and low temperature, and carrying out heat treatment to obtain the RE4TCd material. According to the RE4TCd magnetic refrigeration material and the preparation method thereof, the magnetic entropy change value of the RE4TCd magnetic refrigeration material is 16.4-25.8 J/kg K under the magnetic field change of 0-5, the RE4TCd magnetic refrigeration material has large magnetic entropy change, and the application range of the low-temperature magnetic refrigeration material is widened.

The invention discloses a multi-element negative material magnesium alloy and a preparation method thereof. The multi-element negative material magnesium alloy comprises the following components in percentage by mass: 4-8% of Al, 3-7% of Pb, 0.2-0.4% of Mn, 0.5-1.0% of Zn, 0.6-1.0% of In, 0.8-4.0% of Ga, 0.7-1.7% of Hg, 0.1-0.3% of Ce and the balance Mg. The preparation method comprises the steps that (1) an Mg-Hg intermediate alloy is prepared; (2) the Al, Pb, Mn, Zn, In, Ga, Mg-Hg intermediate alloy and Ce are sequentially added into Mg melt to be stirred and smelted, and heat preservation and still standing are conducted; and (3) semi-continuous casting, homogenizing annealing, hot extrusion breakdown and hot rolling are carried out, and the alloy is obtained. The multi-element negative material magnesium alloy is high in activity, resistant to polarization, high in voltage platform, short in activation time and long in discharge time. The method is simple, low in cost and suitable for industrial production.

The invention provides an in-situ synthesized nanoparticle enhanced CoCrFeNiMn high-entropy alloy and a preparation method thereof. Fine grain enhancement and particle enhancement are combined for theCoCrFeNiMn high-entropy alloy are the same time, the strength of the material is effectively improved through the synergistic effect of fine grain enhancement and particle enhancement, and the yieldstrength of the CoCrFeNiMn high-entropy alloy is remarkably higher than that of ordinary CoCrFeNiMn alloys. High-energy ball milling and the hot extrusion process are combined in the preparation method of the CoCrFeNiMn high-entropy alloy, and by means of the high-energy ball milling method, alloying of elements is achieved, volatilization and segregation of the elements in the smelting and casting process are avoided, and grains are refined; and due to the adoption of the hot extrusion process, rapid powder consolidation is achieved, nanoparticles are synthesized in situ, the CoCrFeNiMn high-entropy alloy with the nanoparticles and the fine grain structure is prepared, and the material strength of the CoCrFeNiMn high-entropy alloy is effectively improved. Furthermore, existing industrialized equipment for producing ODS high-temperature alloys can be directly adopted for the method, cost is low, sizes are not limited, and the in-situ synthesized nanoparticle enhanced CoCrFeNiMn high-entropy alloy and the preparation method are suitable for industrialized production.